What Does P0667 Mean?
The PCM/ECM/TCM internal temperature sensor is reading values outside the expected range for the current operating conditions, indicating a range/performance issue. The internal sensor may be drifting, reading erratically, or not responding proportionally to actual temperature changes. This can affect the module's ability to compensate for thermal drift in its circuits. The driver may not notice immediate symptoms, but the module may not protect itself from overheating conditions.
Common Causes
40%
Degrading internal temperature sensor within the control module
25%
Intermittent power or ground supply to control module causing sensor reading fluctuations
15%
Excessive heat soak from engine compartment affecting module beyond normal range
15%
Water or moisture intrusion causing erratic sensor readings
5%
PCM firmware requiring update for sensor calibration
Diagnostic Steps
1
Monitor the PCM internal temperature PID over a cold start to warm-up cycle — the reading should gradually increase from ambient to a stable operating temp (typically 100-150°F). Erratic jumps or flat-line readings indicate sensor failure.
2
Compare the PCM internal temp reading to the underhood ambient temperature using an infrared thermometer on the module housing — readings should track reasonably close.
3
Inspect PCM power and ground circuits for loose connections, corrosion, or excessive voltage drop (spec: less than 0.1V drop on each ground, power within 0.1V of battery voltage).
4
Check for TSBs related to PCM internal temperature sensor calibration for the specific vehicle. Some manufacturers have issued reflash updates to correct drift.
5
If the module is exposed to direct engine heat, verify all heat shields and deflectors are intact and properly installed.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The PCM/ECM/TCM internal temperature sensor is reading values outside the expected range for the current operating conditions, indicating a range/performance issue. The internal sensor may be drifting, reading erratically, or not responding proportionally to actual temperature changes. This can affe...
The most common cause of P0667 (PCM / ECM / TCM Internal Temperature Sensor Range/Performance) is: Degrading internal temperature sensor within the control module
Typical repair costs for P0667 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive short-term, but the PCM may not be able to protect itself from overheating conditions. If the module overheats undetected, it could fail intermittently, causing stalling or erratic operation. Schedule diagnosis promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0667 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Control Module
Difficulty
Type
Generic (SAE)
Recommended Tools
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